IS 3791: metal paper trays - Specification

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IS 3791 (1983): metal paper trays - Specification [CED 35:
Furniture]

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PROTECTED BY COPYRIGHT

IS 1 8791* 1883

( Reaffirmed 2005 )

Indian Standard

SPECIFICATION FOR
METAL PAPER TRAYS

f First Revision )

UDC 6B4-49'G44

® Copyright 1984

INDIAN §TANI>ARDS INSTITUTION

IKANAK BHAVAN, N BAHADUR SHAH ZAFAR MARO
NiiW DELHI I1W02

Gt | March 198]^

IS : 3791 - 1983

Indian Standard

SPECIFICATION FOR
METAL PAPER TRAYS

( First Revision )

Furniture Sectional Committee, BDC 35
Chairman

Shri A. Bharadwaj
207, Golf Links, New Delhi

Members Representing

Shri A. M. Chaki Calcutta Cabinet Maker's and Furnishers'

Association, Calcutta
Shri R. S. Dugoal Engineer-in-Chief's Branch, Army Headquarters,

New Delhi
Shri S. C. Garg ( Alternate )
Shri I. P. Figueredo Godrej & Boyce Maunfacturing Co Pvt Ltd,

Bombay

Shri H. H. Jamshedji ( Alternate )
Shri T. N. Gupta Central Building Research Institute ( CSIR ),

Roorkee

Shri V. K. Aggarwal ( Alternate )
Shri D. B. Jain Directorate General of Supplies and Disposals,

New Delhi

Shri O. D. Sanger ( Alternate )
Dr M. L. Mehta Ministry of Education & Social Welfare, New

Delhi

Shri P. N. Mathur ( Alternate )
Shri J. A. Panchal National Institute of Design, Ahmadabad

Shri H. K. Vyas ( Alternate )
Shri Ashok C. Patbl Chandan Metal Products Pvt Ltd, Vadodara

Shri Arun C. Patel ( Alternate )
Shri P. Rajagopalan Indian Institute of Architects, Bombay

Representative Small Industries Service Institute, New Delhi

Shri S. N. Sanyal Forest Research Institute and Colleges, Dehra

Dun
Shri M. B. Saxena Central Public Works Department, New Delhi

Architect ( NZ ) VIII ( Alternate )

Col G. B. Singh The Indian Plywood Manufacturing Co Ltd, New

Delhi
Dr A. Purushotham ( Alternate )

( Continued on page 2 )

© Copyright 1984

INDIAN STANDARDS INSTITUTION

This publication is protected under the Indian Copyright Act (XIV of 1957 ) and
reproduction in whole or in part by any means except with written permission of the
publisher shall be deemed to be an infringement of copyright under the said Act.

IS j 3791 - 1983

( Continued from page 1 )

Members Representing

Shri P. B. Sheth Ahmedabad Eagle Engineering Enterprises Pvt

Ltd, Ahmadabad
Shri B. L. Sheth ( Alternate )
Shri L, G. Toye Research, Design and Standards Organization

( Ministry of Railways ), Lucknow
Shri V. K. Punj ( Alternate )
Shri N. Venkataraman The Western India Plywoods Ltd, Distt

Cannanore ( Kerala )
Shri N. E. Govindan ( Alternate )
Shri G. Raman, Director General, ISI ( Ex-officio Member )

Director ( Civ Engg )

Secretary

Shri A. K. Avasthy
Assistant Director ( Civ Engg ), ISI

Metal Furniture Subcommittee, BDC 35 : 1

Convener

Shri J. A. Panchal National Institute of Design, Ahmadabad

Members

Shki H. K. Vyas ( Alternate to
Shri J. A. Panchal )
Shri J. K. Aggarwal Engineer-in-Chief's Branch, Army Headquarters,

New Delhi
Shri M. N. Khullar ( Alternate )
Shri V. K. Agrawal Hindustan Aluminium Corporation Ltd, Bombay

Shri Atma Ram Behki The Small Scale Steel Furniture Manufacturers'

Association ( Regd ), New Delhi
Shri Shiv Kumar Kapahi ( Alternate )
Shri I. P. Figueredo Godrej & Boyce Manufacturing Co Pvt Ltd,

Bombay
Shri H. H. Jamshedji ( Alternate )
Shri Gopal Ramnarayan Featherlite Corporation, Bangalore

Shri Baldev Ramnarayan ( Alternate )
Shri D. B. Jain Directorate General of Supplies and Disposals,

New Delhi
Joint Director of Industries The Director of Industries and Commerce,

and Commerce ( RP ) ( Government of Tamil Nadu ), Madras

Deputy Director of Industries
and Commerce ( L C ) ( Alternate )
Shri Ashok C. Patel Chandan Metal Products Pvt Ltd, Vadodara

SHRI Arun C. Patei. ( Alternate )

IS : 3791-1983

Indian Standard

SPECfFJCATION FOR
METAL PAPER TRAYS

( First Revision )

0. FOREWORD

0.1 This Indian Standard ( First Revision ) was adopted by the Indian
Standards Institution on 30 December 1983, after the draft finalized by the
Furniture Sectional Committee had been approved by the Civil Engineering
Division Council.

0.2 Sheet metal furniture is being made in the country for over a number
of years. However, the sizes, finish and function of furniture items as
made by various manufacturers required to be co-ordinated. This standard
was, therefore, first prepared in 1966 to rationalize the sizes and specify the
finishes consistent with corrosion protection. In this revision the grade of
materials to be used in components have been specified.

0.3 This standard contains clause which requires the purchaser to supply
certain technical information at the time of placing orders ( see 9 ).

0.4 In the formulation of this standard due weightage has been given to
international co-ordination among the standards and practices prevailing
in different countries in addition to relating to the practices in the field in
this country.

0.5 For the purpose of deciding whether a particular requirement of this
standard is complied with, the final value, observed or calculated, expres-
sing the result of a test or analysis, shall be rounded off in accordance
with IS : 2-1960*. The number of significant places retained in the rounded
off value should be the same as that of the specified value in this standard.

1. SCOPE

1.1 This standard lays down the requirements for materials, size, cons-
trucion attd finish of metal paper trays.

♦Rules for roiinding off numerical values ( revised J.

3

IS : 3791 - 1983

2. MATERIALS

2.1 Aluminium Sheets — Aluminium sheets shall conform to \ H condition
of 19000 quality of IS : 737-1974*.

2.2 Electrodes — Electrodes for gas and arc welding shall conform to
IS : 1278-1972f and IS : 814 ( Part 2 )-1974$.

2.3 MiJd Steel Sheets — Mild steel sheets shal conform to grade of
IS : 1079-1973§ or grade of IS : 513-197311.

3. DIMENSIONS AND TOLERANCES

3.1 The overall dimensions of paper trays shall be as given below:

a) Length 380 mm,

b) Width ^255 mm, and

c) Depth 65 mm.

3.2 Tolerances — The overall dimensions specified in 3.1 shall not vary
by more than ± 5 mm.

4. FABRICATION

4.1 The tray shall be made from steel sheet not less than 0"8 mm thick and
aluminium sheets not less than 1*0 mm thick and without any burrs or dents.
The top edges shall be bent over and pressed into a knife edge, as shown
in Fig. 1.

5. ASSEMBLY

5.1 The sides and bottom shall be assembled by means of welding.

i5.2 The method of gas, arc and spot welding shall conform to
IS : 1323-1966H, IS : 816-1969**, IS : 819-1957tt and IS : 2812-1964Jt

♦Specification for wrought aluminium and aluminium alloys, sheet and strip ( for
general engineering purposes ) ( second revision ).

^Specification for filler rods and wires for gas welding ( second revision ).

^Specification for covered electrodes for metal arc welding of structural steel: Part 2
For welding sheets ( fourth revision ).

§Specification for hot rolled carbon steel sheet and strip ( third revision ).

^Specification for cold rolled carbon steel sheets (second revision ).

^Code of practice for oxy-acetylene welding for structural work in mild steel
( revised ).

**Code of practice for use of metal arc welding for general construction in mild steel
(first revision ).

ttCode of practice for resistance spot welding for light assemblies in mild steel-

^Recommendations for manual tungsten inert-gas arc-weldifig of altirrifnittm and
aluminium alloys.

IS : 3791 - 1983

/>

I

12*5

ENLARGED DETAIL
OF KNIFE EDGE

All dimensions in millimetres.
Fig. 1 Metal Paper Tray

6. ADDITIONAL ACCESSORY

6.1 The following additional accessory may be provided, if so described
by the purchaser:

Spring Clip — The paper tray shall be fitted with a suitable spring
clip inside on one of the shorter sides to hold papers.

7. FINISH

7.1 All dents, burrs and sharp edges shall be removed from the various
components. The components shall be individually pickled, scrubbed and
rinsed to remove grease, rust, scale or any other foreign element.

IS : 3791 - 1983

7.2 Immediately after pickling all the mild steel parts shall be given phos-
phating treatment conforming to Grade C of IS : 3618-1966*. The process
for application of phosphate coating shall be in accordance with
IS : 6005-1970t.

Note — Putly shall be applied to all the surface requiring filling and shall
conform to IS : 110-1968 J. Aluminium primer shall conform to IS : 5660-1970§.

7.3 Coat/coats of enamel paint shall then be applied as follows:

a) Finish coat with enamels conforming to IS : 151-195011,
IS : 2932-197411 or IS : 2933-1975**; and

b) In case of stoving enamel the components shall thereafter be
baked at a specified temperature in an oven heated uniformly.
The finish shall be smooth and uniform with a hard and tough
film of enamel strongly adhering to the surface. The finish
shall be free from all visible defects and shall not chip when
tapped lightly with a dull pointed instrument.

7.3.1 The finish shall be smooth, uniformly applied and free from
visible defects. It shall be hard and shall not readily chip or flake. The
dry film thickness shall be not less than 0"10 mm.

8. PERFORMANCE REQUIREMENTS OF FINISH

8.1 Scratch Hardness Test — A sample of mild steel plate 150 X 50 mm in
size and thickness 0*315 mm and finished as given in 7 shall be subjected to
scratch hardness test in accordance with 15.1 of IS : 101-1964tt. A scratch
showing the bare metal shall not be produced on the test sample.

8.2 Pressure Test — Samples prepared from mild steel plates of thickness
0'315 mm and finished as given in 7 shall be subjected to pressure test in
accordance with 15.2 of IS : 101 -1964tt. The metal surface shall not be
rendered visible when the test pieces are separated after the test.

♦Specification for phosphate treatment of iron and steel for protection against
corrosion.
tCode of practice for phosphating of iron and steel.

^Specification for ready mixed paint, brushing, grey filler, for enamels for use over
primers ( first revision ).
§Specification for ready mixed paint, brushing, aluminium red oxide primer.

f| Specification for ready mixed paint, spraying, finishing, stoving, enamel for .general
purposes, colour as required.

f Specification for enamel, synthetic, exterior (a) undercoating (b) finishing (first
revision )

♦^Specification for enamel, exterior (a) undercoaiins (b) finishing (first revision ).

tfMethods of test for ready mixed paints and enamels ( s?gond revision ).

IS ; 3791 - tm

8.3 Flexibility and Adhesion Test — A sample of mild steel plate 150 x 50
mm in size and thickness 0'315 mm and finished as given in 7 shall be sub-
jected to flexibility and adhesion test in accordance with 16 of IS : 101-
1964*. The paint film on the test piece shall not show damage, detachment
or cracking when examined under XlO magnification.

8.4 Stripping Test — A sample of mild steel plate 150 X 50 mm in size

and thickness 0"315 mm and finished as given in 7 shall be subjected to
stripping test in accordance with 17 of IS : 101-1964*. The scratch produced
after the test shall be free from jagged edges.

8.5 Test for Protection Against Corrosion Under Conditions of Condensation

— . A mild steel panel of size 150 X 100 mm in size and thickness 1*25 mm
and finished as given in 7 shall be subjected to test for protection against
corrosion under conditions of condensation in accordance with 18 of
IS : 101-1964*. A metal surface shall show no signs of corrosion after the
test.

9. INFORMATION TO BE SUPPLIED BY THE PURCHASER

9.1 The purchaser shall supply the following information to the supplier
along with the order:

a) Colour and finish, and

b) Where alternative methods of construction and finish are speci-
fied, they shall be clearly stated in the order.

10. MARKING

10.1 All metal paper trays shall be marked with a suitable mark identifying
the manufacturer.

10.1.1 The metal paper trays may also be marked with the ISI Certifi-
cation Mark.

Note — The use of the ISI Certification Mark is governed by the provisions of
the Indian Standards Institution ( Certification Marks ) Act and the Rules and
Regulations made thereunder. The ISI Mark on products covered by an Indian
Standard conveys the assurance that they have been produced to comply with the
requirements of that standard under a well-defined system of inspection, testing
and quality control which is devised and supervised by ISI and operated by the
producer. ISI marked products are also continuously checked by ISI for con-
formity to that standard as a further safeguard. Details of conditions under
which a licence for the use of the ISI Certification Mark may be granted to
manufacturers or processors, may be obtained from the Indian Standards Insti-
tution.

♦Methods of test for ready mixed paints and enamels ( second revision ).